Speedometer



Oct. 26 1926.

W. WILLIAMSON SPEEDOMEYTER Filed me '4, 1918 2 Sheets-Sheal Oct. 26 1926. 1,604,212

= W. WILLIAMSON SPEEDQMETER Filed June 4, 1918 i 7 4 6 L5 7 a 6' 6 2 Sheets-Sheet 2 Patented Oct. 2 6, 1926. 1

WALTER WILLIAMSON, or nvnnnrcv, messncnusnrrs.

SPEEDOMETER.

Application filed June 4,

This invention relates to speedometers and its object is to secure a speedometer of a high degree of accuracy and of simple construction and one that is adapted to scientific purposes, where exact measurements of speed are required.

It is illustrated by the accompanying drawings in which:

Fig. 2 is a plan view with the dial removed;

Fig. 3 is a sectional view on line 33 Fig. 2;

Fig. 4 is a sectional view on. line 4c-4E Fig. 2;

Fig. 5 is an enlarged sectional view on line 5-5 Fig. 2;

Fig. 6 is a sectional View on line 6-6 5;

Fig. 5;

.he several parts of the device are mounted on frame 1, through which extends main driving shaft 2 carrying on its inner end bevel gear 3 which engages bevel gear 4: on sleeve 5 journalled in the frame and furnished interiorly with a series of ball and socket bearings 6 which engage spiral groove 7 on speed disc shaft 8slidingly and rotatively disposed in sleeve 5 and having a bearing 9 in the frame; which arrangement provides for a limited lengthwise movement of speed disc shaft 8 in sleeve 5.

This speed disc shaft is furnished near its outer end with speed disc 10 rigidly affixed thereto, which speed disc rests on time disc 11 at right angles thereto, said time disc 11 being rigidly aftixed to arbor 12 of the clock mechanism, which arbor is furnished with spring 13 adapted to hold the discs in frictional contact.

The outer end of speed disc shaft 8 con tacts with the arm 14: mounted on the upper end of shaft 15 journalled in the frame and carrying at its lower end sector 16 which engages spring controlled pinion 17 on the lower end of shaft 18 journalled in the frame and carrying on its upper end hand. 19 adapted to indicate speeds on dial 20.

The arrangement of the various parts is such that normally (when main shaft 2 is not rotating) speec disc 10 contacts with the center of time disc 11 and thus positioned in not affected by the rotation of the time 7 is a sectional view on line 7- 7 .disc and consequently the hand 1918. Serial No. 238,103.

points to (l on the dial. y

it may be here noted that, when the time disc is rotating, its center is of course stationary, while the speed of any other point on the disc is proportionate to its distance from the center being. tance increases.

Fig. 1 is a plan view showing the dial;

greater as such dis .Vmen the mainshaft 2 begins to rotate, it rotates sleeve 5, while speed disc 10 by its spring-controlled frictional engagement with the center of time disc 11 prevents speed disc shaft 8 from freely rotating with the sleeve, and speed disc shaft 8 in con sequence driven outwardlyby means of the ball and socketbearings 6 traveling in spiral groove '2', thereby carrying the speed disc out from the center of the time disc to point which travels at a speed equal to that of the sleeve, when the two discs travel synchronously at a speed indicated on the dial; and, as thespeed of the main shaft increases or decreases, the point of contact between the discs travels away from or to- .wards the center of the when the main shaft ceases to. rotate, the

time disc; and,

point of contact between the discs is again the center of the time disc; and the spring controlled 13111101117'1'6h111118 the hand. 19

to O on the dial and through sector 16 maintains the engagement of arm 14: with the outer end of shaft 8 through all its movements.

Another feature of the invention is the employment of the main shaft 2 to wind the clock and keep it wound during the rotation of said shaft; for which purpose the shaft is furnished with fixed collar 21. which carries lug 22 adapted, when the shaft rotates, to engage lug 23 carried by pawl 24: pivoted at to the side of the hollow ratchet wheel 26 and held against said ratchet wheel by spring 27; said wheel being rotatably mounted on main shaft 2 and controlled by spring pressed pawl 28 mounted on the frame; the pawl 2i being furnished with lug 29, which amends through slot 30 in the ratchet wheel; to which lug 29 is fixed the outer end of the clock spring 31 disposed in said hollow ratchet wheel and having its inner end attached to hub of clock gear rotatably mounted on shaft 2 and engaging pinion l9.- atlixed to time disc arbor 12.

By this arrangement shaft 2 rotates ratchet wheel 26 thereby winding clock spring 31 until said spring in the process of winding draws lug 29 inwardly until lug 23 slips past lug 22, the clock spring then being wound; and as said spring unwinds it carries lug 29 outwardly and lug 23 is again engaged by lug 22 and thereby renews the winding process and prevents the clock from running down so long as shaft 2 rotates; andwhen shaft 2 ceases to rotate the clock gradually runs down and remains in that conditionuntil again wound up as explained.

Still another feature of the invention is the employment ofshaft' 2 to perform the further function of operating the counter shafts 34' and 35 and this is accomplished by furnishing the sleeve 5- with the gear 36' which en a es inions 37 and 38' enb o p gaging respectively the gears 39 and 40 affiired respectively to said counter shafts, 34: and 35 carrying respectively the count-er discs 41, and 42.

I claim: 1. In a device of the class described, the

' combination of a driving element adapted to be driven by a mechanism the speed of which isto be indicated, a driven element,

mechanism operated by said driving element for actuating said driven element, said mechanism including a spring; means operable by said spring whereby said spring may be wound by said driving element, clock mechanism for controlling the speed of said driven element, independent means operatively connected with said driving element and with said driven element and arranged to change. its position as the relative speeds of said driving and driven elements vary, and indicating mechanism connected with and operated by said independent means.

2. In a device for indicating the speed of a mechanism, a movable element adapted to be driven at a speed proportional to the speed of said mechanism, a second movable element, means for actuating said second named element including a spring means operable by said spring whereby said spring may be wound by said first movable element, means comprising a clock mechanism, for controlling the speed of said second-named element, means operatively connecting said elements to effect relative movement thereof upon change in their relative speeds, and indicating'means actuated by the relative movement of said elements.

3; In a device for indicating the speed of said discs upon change in the relative speeds of' said first=named disc, and said spindle.

In testimony whereof I have aflixed my signature.

WALTER WILLIAMSON. 

